Development of the electronic "Safing" system for airbag ECUs

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1 Development of the electronic "Safing" system for airbag ECUs Hiroyuki Komaki Syusaku Kuroda Toshinari Nioka Hiroyuki Konishi Masataka Wakamoto Abstract With the recent increase in automotive safety consciousness, 4 channel airbag systems that cover the driver and passenger seats with seatbelt pretentioners have become standard equipment. To reduce car accident injuries and fatalities, the trend towards the standardization of side airbags and curtain airbags is accelerating. In response to these demands, high-functionality and large scale cost reduction are required. However, as airbag systems are important safety devices for automobiles, reliability requirements are very strict. Thus, a big issue has been the establishment of high functionality and cost reductions while maintaining conventionally high levels of reliability. In this paper, the development of the electronic "Safing" system is introduced as one of the key factors for cost reduction technology, which achieves the high level of reliability of conventional systems. 17

2 FUJITSU TEN TECHNICHAL JOURNAL Introduction History of airbag ECU(Electronic Control Unit) development at our company Overview of airbag systems 3.1 Airbag system structure 18

3 Development of the electronic "Safing" system for airbag ECUs Objectives of the developed system 3.2 Role of the Safing system 3.3 Technological changes in the safing system 1) Trigger sensor safing system [Standard ECU (6 channels)] 2) Fully electronic safing system [high functionality ECU (14 ch)] 19

4 FUJITSU TEN TECHNICHAL JOURNAL Technical development details 5.1 Airbag fail safe design concept [Hard duplex system structure] 5.2 Trigger sensor safing system technology 20

5 Development of the electronic "Safing" system for airbag ECUs Trigger sensor 1) Impact detection method 2) Merits of trigger sensors 3) Features of trigger sensors 4) Technical issues accompanying structural changes Issue 1: Weight sliding performance Issue 2: Contact bounce 5) Countermeasures for technical issues Countermeasure 1: Adoption of sliding grade resin materials Countermeasure 2: Adoption of integrated circuits 21

6 FUJITSU TEN TECHNICHAL JOURNAL Trigger sensor detection interface 1) Interface configuration 2) Electrical noise resistant design of the ON detection circuit, and the latch function 3) ON bounce countermeasures via filter circuits 4) Electrical noise resistance countermeasures via filter circuits 22

7 Development of the electronic "Safing" system for airbag ECUs Other failsafe designs 1) Design concept for ASIC chip layout 2) Firing upstream MOSFET arrangement 23

8 FUJITSU TEN TECHNICHAL JOURNAL 5.3 Fully electronic safing system technology CPU system concept 1) System structure 2) Microprocessor issues and the necessity of dual CPUs 3) Failsafe design with dual CPU structure It should be structured such that the microprocessor cannot participate in the sub microprocessor determination. 24

9 Development of the electronic "Safing" system for airbag ECUs Failures occurring with sub microprocessors should all be capable of self diagnosis via the sub microprocessor Structure of the sub microprocessor 1) System structure 2) Safing ON control methods System extension performance 25

10 FUJITSU TEN TECHNICHAL JOURNAL Future safing system development Conclusion Profiles of Writers Hiroyuki Komaki Entered the company in Since then, has engaged in the development of air bag ECU hardware. Currently in the 2nd Engineering Department, ITS-Business & Safety System Division, Business Division Group. Hiroyuki Konishi Entered the company in Since then, has engaged in the development of electronic devices for automobiles. Currently the Manager of the 2nd Engineering Department, ITS- Business & Safety System Division, Business Division Group. Syusaku Kuroda Entered the company in Since then, has engaged in the development of electronic devices for automobiles. Currently in the 2nd Engineering Department, ITS-Business & Safety System Division, Business Division Group. Masataka Wakamoto Entered the company in Since then, has engaged in the development of electronic devices for automobiles. Currently the Manager of the 2nd Engineering Department, ITS- Business & Safety System Division, Business Division Group. Toshinari Nioka Entered the company in Since then, has engaged in the development of air bag ECU hardware since 1995, by way of hybrid IC and mounting engineering development. Currently in the 2nd Engineering Department, ITS-Business & Safety System Division, Business Division Group. 26

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